Finn Lassen wrote:
Perry Mick wrote:
Actually, I believe Perry Mick is flying with a stock ECU
in his ducted fan Long EZ.
Ed Anderson
Yes Ed I am still using it. Just some observations, FWIW:
Think about car usage, the only time you generally run up into the higher
engine RPMs is when you are accelerating. Usually just before a gear shift.
I measured the voltage on the O2 sensor and found it is running rich in cruise.
I think Mazda does this purposely to get best power during acceleration. The
O2 sensor is only used in feedback mode below approx. 3500 RPM (cruise RPM
in a car), the only time I am operating there is base-final, and there the
mixture was right on stoichiometric.
Running in the 5200 RPM range in cruise I'm burning 7.5 to 8 gph, which is
not great power, but I'm sure the fuel burn could be reduced if I had a manual
leaning function. I plan to fake out some sensor inputs to see what the effect
is on mixture. The ECU does have an atmospheric pressure sensor that automatically
compensates for altitude and this works flawlessly up to at least 13,500 ft
(the highest I've been so far).
--
Perry Mick
http://www.ductedfan.com
Perry, what about the warnings about not using a stock ECU because it shuts
down the engine if it runs out of water or oil (or missing some other sensor
inputs)? Or was that for some other engine?
Finn
Nonsense rumor started by someone. It will shut down the engine if the exhaust
system in the car overheats, why would I hook up that input?
--
Perry Mick
http://www.ductedfan.com
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